/* open.c * Linux CAN-bus device driver. * Written by Arnaud Westenberg email:arnaud@wanadoo.nl * This software is released under the GPL-License. * Version 0.7  6 Aug 2001 */#define __NO_VERSION__#include <linux/module.h> #include <linux/autoconf.h>#if defined (CONFIG_MODVERSIONS) && !defined (MODVERSIONS)#define MODVERSIONS#endif#if defined (MODVERSIONS)#include <linux/modversions.h>#endif#include <linux/fs.h>#include <linux/malloc.h>#include <linux/version.h>#include "../include/main.h"#include "../include/open.h"#include "../include/i82527.h"#include "../include/setup.h"int can_open(struct inode *inode, struct file *file){	struct msgobj_t *obj;	struct chip_t *chip;	struct canfifo_t *fifo;	if ( ((obj=objects_p[MINOR_NR]) == NULL) || 			((chip=objects_p[MINOR_NR]->hostchip) == NULL) ) {		CANMSG("There is no hardware support for the device file with minor nr.: %d\n",MINOR_NR);		return -ENODEV;	}	if (objects_p[MINOR_NR]->flags & OPENED) {		CANMSG("Sorry, only single open per device file.\n");		return -EBUSY;	}	else		objects_p[MINOR_NR]->flags |= OPENED;	if (chip->flags & CONFIGURED) 		DEBUGMSG("Device is already configured.\n");	else {		if (chip->chipspecops->chip_config(chip))			CANMSG("Error configuring chip.\n");		else			chip->flags |= CONFIGURED; 	} /* End of chip configuration */	/* Allocate output buffer memory for the opened device */	fifo = objects_p[MINOR_NR]->fifo;	fifo->buf_tx_entry=(struct canmsg_t *)kmalloc(MAX_BUF_LENGTH * sizeof(struct canmsg_t), GFP_KERNEL);	if (fifo->buf_tx_entry == NULL)		return -ENOMEM;	else		if ( add_mem_to_list(fifo->buf_tx_entry) )			return -ENOMEM;	/* Allocate input buffer memory for the opened device */	fifo->buf_rx_entry=(struct canmsg_t *)kmalloc(MAX_BUF_LENGTH * sizeof(struct canmsg_t), GFP_KERNEL);	if (fifo->buf_rx_entry == NULL)		return -ENOMEM;	else		if ( add_mem_to_list(fifo->buf_rx_entry) )			return -ENOMEM;	/* In- and output buffer initialization */	fifo->tx_readp = fifo->buf_tx_entry;	fifo->tx_writep = fifo->buf_tx_entry;	fifo->rx_readp = fifo->buf_rx_entry;	fifo->rx_writep = fifo->buf_rx_entry;	fifo->rx_size = MAX_BUF_LENGTH * sizeof(struct canmsg_t);	fifo->tx_size = fifo->rx_size;#if (LINUX_VERSION_CODE <= KERNEL_VERSION(2,2,19))	init_waitqueue(&fifo->readq);	init_waitqueue(&fifo->writeq);#else	init_waitqueue_head(&fifo->readq);	init_waitqueue_head(&fifo->writeq);#endif	fifo->rx_in_progress = 0;	fifo->tx_in_progress = 0;	fifo->head = fifo->tail = 0; //TEMP!!	if (chip->chipspecops->pre_read_config(chip,obj)<0)		CANMSG("Error initializing chip for receiving\n");			MOD_INC_USE_COUNT;		return 0;}